Stormwater filtration BMPs - treatment properties Stormwater filtration BMPs - treatment properties

Stormwater filtration BMPs - treatment properties
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Stormwater BMP	Illustration	Pollutant Removal Mechanism	Location in Treatment Train	Pollutant Removal 1	Potential Application
Dry swale or step pool		Sedimentation / Infiltration	Throughout	TSS: Medium TN: Low TP: Medium Chloride: Low Metals: Medium Oils and Grease: Low Pathogens: Low	Residential Commercial Industrial Highway/Road Recreational
Wet swale		Sedimentation / Transpiration	Throughout	TSS: Medium TN: Low TP: Low Chloride: Low Metals: Low Oils and Grease: Low Pathogens: Low	Residential Commercial Industrial Highway/Road Recreation
Biofiltration Basin		Sedimentation / Filtration	Beginning	TSS: High TN: Low/Medium TP: Medium/High2 Chloride: Low Metals: High Oils and Grease: High	Residential Commercial Retrofit
Permeable pavement with underdrain		Filtration	Beginning	TSS: High TN: Medium/High TP: Medium/High Chloride: Low Metals: High Oils and Grease: High	Residential Commercial Ultra Urban Retrofit
Tree Trench/Tree Box (with underdrain)		Filtration, Transpiration	Throughout	TSS: High TN: Medium/High TP: Medium/High Chloride: Low Metals: High Oils and Grease: High Pathogens: High	Commercial Ultra Urban Retrofit
Media filter (sand filter)		Filtration	Throughout	TSS: High TN: Medium TP: Medium/High Chloride: Low Metals: Medium/High Oils and Grease: High Pathogens: High	Residential Commercial Industrial Recreation
Green roof		Filtration	Throughout	TSS: High TN: Low TP: Low Chloride: Low Metals: High Oils and Grease: High Pathogens: High	Residential Commercial Ultra Urban Industrial Retrofit

¹² Low = < 30%; Medium = 30‐65%; High = 65‐100%
²Some media mixes can leach phosphorus.